Dermatitis herpetiformis is an itchy, blistering skin rash that can be a sign that you have gluten intolerance.
Gluten enteropathy, or coeliac disease, affects the majority of children and adults with dermatitis herpetiformis. It is characterised by small bowel villous atrophy. This means that instead of being highly convoluted, the lining of the intestines is smooth and flattened. The result is poor or very poor absorption of nutrients. The patient may feel well or develop the following symptoms:
Abdominal discomfort and bloating (75%)
Weight loss (30%)
Constipation (30%) or diarrhoea (50%)
Pale stools that float on the surface of the toilet pan
Bone fractures due to osteoporosis
All information via http://www.dermnetnz.org/topics/dermatitis-herpetiformis/